Spring shackle



April 5, 1932- J. w. LEIGHTON 1,852,321

SPRING SHACKLE Filed Sept. 3, 1951 Patented A r. 5, 1m

UNITED STATES PATENT OFFICE Application filed September 8, 1831. SerialIo. 560,887.

The principal objects of this invention are to provide a spring shacklewhich will eliminate side play and will reduce'wear to the minimum andwhich may be very easily installed.

The principal feature of the invention consists in the novelconstruction of a pair of shackle members adapted to be interconnectedand each having a threaded bearing portion D rotatably engaging athreaded surface in the supporting members.

the drawings Fi re 1 is an elevational part sectional view 0 the device.

Figure 2 is a side elevational view.

The constructionof shackle herein shown comprises a pair of bars 1 and2, each similarly formed with a right angled bent portion 3 threadedexternally for the major portion of its len h and having a reduced end4. The opposite end of each of the members 7 1 and 2 is formed with anenlarged head end 5 which is bored transversely to receive the reducedend 4 of the mating member.

The head is split transversely with a slot 6 and a clam ing screw 7 isarranged to extend across t e slot to bind the head upon fie reducedextension 4 of the mating mem- Each of the threaded right angular rl.tions 3 are threaded into bushings 8 and t ese bushings are pressed intoor otherwise secured in cylindrical openings in the frame bracket 9 andspring end 10 respectively.

The terminal ends of the reduced portions 4 are bored to form alubricant passage which connects with the threaded surface about midwayof its length and a suitable fitting 11 is arranged at the other end.The threaded portions of the shackle membars are a free turning fit inthe threaded bushin and the bushings are held from rotation in asupporting bracket and sprin end i so that the oscillating movement 0the shackle is carried by the surfaces of thethreaded members, thusproviding a greater bearing surface than the actual length of thebushinfi, and also eliminating any end play of the s ackle bolt in thebushings. This entirely obviates binding of moving surfaces 0 and thelubricant is applied centrally and works outwardly to both ends,ensuring always that the bearing surfaces will be lubricated and dirtwill be prevented from entering between the bearing surfaces.

In the assembly of this shackle, the bushings are mounted on theindividual shackle members and they are then pressed into place in theframe lug and the spring eye, the reduced ends of the threaded portionsbeing brou ht into alignment with and entering the bored and slottedends. When the bushings have thus been properly placed, the jaw memhersare tightened by means of the screws 7.

structure such as described is very easily and simply manufactured andassembled and when in position will be extremely efiicient to resistwear and side thrust and as there are no flat contact surfaces liable torub dry, squeaking will be eliminated.

What I claim as my invention is:

In a spring shackle, the combination with the spring end and the frameend, each havin a threaded transverse bearing, of a pair 0 shacklemembers each having threaded portions engagingsaid threaded bearings andportions extending parallel, said parallel extensions having bored andslotted ends, bind ing screws extending across the slotted ends, and thethreaded portions having reduced extension portions each fitting theoppositely Q bored end of the other shackle member.

JOHN WYOLIFFE LEIGHTON.

